SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '088bfd64fad3ef962cfa3d42e75917733a42f159317753bc825a1bbf68ea13dc' 
  AND token = 'ZSAZ8qz/ILGH0T/L3+sCkh/cvxANVsiAvojjyoPxjtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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