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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03ff37159a1e67d5edbca2d8d4f4f820a2907237bd17b766cfb8a1c453a86af0' 
  AND token = 'tPnxhMmbY1Pb4W7dgEXLD1BZCh1g7cG29ulsdiANj9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}