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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '474ac69f09f297d5dbcf8b68170d258bdfe21b7203e6d97dd81fdfaf1fa71744' 
  AND token = '7p82qc4iZbMtSwK7z1J6JgOTT60wV1zhOfutTjroRiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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