Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4b8a1b7512a2c4030540dd929b6997ebafebb8f9ff0d5fe1fec3563728ad6f4' 
  AND token = 'tVM7MV4n5e5lhQoacFCMsVbp9HU1N2qTOI/2J3aaCBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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