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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f358de0edc3e3e94d7443ad86a2c0882238acf125a908397f5ce5317f5319eaf' 
  AND token = 'PrLcvhm6zcXkz+PVemMFxYKn9Oyi+jH7gHaMyzOjEoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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