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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c82ef2ddbb212bb8042c725b9effaee783f8bcae17c6cc5256acfec8d99fb8e1' 
  AND token = 'ZJA4tAZIUK2KjB2URFICRqCY8FlIa2PUbnrTcCBeryg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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