SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2774b3fb908ba14a7c56b719c09b2385309f1bb854bab4c9ead69460efdf17d9' 
  AND token = '+EEWdvZ2wldiNJreYg4C4usm4+hjsv0Km/FzjVrNeJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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