SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fd6104aa03262acfe965492360b1eb672da5fbfcedc43f598c8055142882923' 
  AND token = 'YKTTBS6qmUO5mgfWemYCQ/TQDKhyCf8zd19wNUG7hq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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