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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c28dedf80c8c9d799ae7efa5cee6b418c623e0b0f3d4362a38e96a119d62672e' 
  AND token = 'AMdvbemCf5yNskdXYNV0wcKkZZBc4zaLWRTtVaYAtvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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