SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4faa9744c4db11253a9fb86d21f91064f695769cc2716b65c2c754b5c87f5f4' 
  AND token = 'Db2XRU3wPGCdH8YB2qnpIohR68j/drye81COsl+caN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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