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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dbaea20466ce98bce68a9bcc221e7cf0e34b8877f3a00ab8e7437347f45ba0c' 
  AND token = '9m8hk+Chj7jzMfjZOmSJTXoVIVxybndXfds6NFkD5iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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