SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '085cafd13b7eae300e2e54d72389ef19290b2b6c4f9657b37120889d666fe547' 
  AND token = 'mUs+Js9CkT0tKHeTsYbzQdiL1h1AGHVpElFkLe2VBWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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