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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f073b68342e9cec4563c5012193d2b21683ae741ae8461751abe4298540ac084' 
  AND token = 'xcwp3DhcUAteidELI2zm8GnqjMXxGNAwGt8fmbYaybA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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