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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f73b9d409cc3465c73566a80e8b688cd2968d0e17c3543ea237f8fce86297657' 
  AND token = 'FtqZzaV9JFt1JM2uNPq9yxCjgWTnJgb9woyzyCit3b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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