SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ff1d0c68433b1a24562721fc466462d7098a37340f541f56b741fdab53d33e0' 
  AND token = '4tYJmJjaaXZ0Qs8lI7gdAuw/kjRwp1nqhF2BdhG68nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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