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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '413c37a3ad84a7fe817a7d583bfcbd47e2332dc2ae611512d339ff123da5c9b6' 
  AND token = 'ByZBPk4v0OT/K8CbZaf60wltQcjHU9L2Ma2f8SAxTWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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