SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ac31c89ac27881bb213ab91ac29f2d6b0d46d0d6c7c6f2a6e803e2c57066797' 
  AND token = '5tPiLL+vvusjQRYouVSiCKyqH6hkgf5ak6JPDWyUXSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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