SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e717b57ee317f7c37241b40a2b2f9cd61032bf55eaff706eb72a227f189ec829' 
  AND token = 'JPhfSwSiYbw0HZIdD6LsLOUekH1AuVhFGfrh+qXvOnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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