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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '526709c6aaecef583f45f58fd5722cfed0565ff6356570fc330ad31fd671355d' 
  AND token = '/kJmxuOIxLWsAAyXn+kDlnuXqkaQ20r+qM4EElbAJbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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