SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b91a345acd63cf4edc8c685933045812bffa4b5e757f8e62d1374f0e2d0bb51d' 
  AND token = 'XYt7WxPNcCpV8WcshQR+M0UCG9KbigqkGqe3DF797yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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