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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27cdc57d81a01cb4614893b386f6b850ae9e67fd21bb6685f6896886829bd78c' 
  AND token = '8QiJAZoVlIoGYGz6hEHf6iphk0vOtLDCI4nCO9nv46k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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