SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6f2c37324af9abb54f4695943f4b6476632b043ecfbea5d626f88d09edbc655' 
  AND token = '19IooyLFHH/E4JqNBB+Zq04SO4HRv9YKGA/2LO8ADfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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