SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '811af80ce5ab3db58a067326e383b2192940fd790d1279147343e99b99471e16' 
  AND token = '48Ud8A4Z4ae/WyBilNqUBtxJQzDtgCigOh5jNG6vpiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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