SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '329b608994075fbd3fcafc1d41f7b411274ce5594ed946b35ee1ec0f921f1ddb' 
  AND token = 'cg+TA1LIYYiDkG6rquTsr0ujNTpMbgcvJI4xfXghzB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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