SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c219cf93b2869bf2f391845628c0bafd83ca51b4df5132db79bf358a6826f071' 
  AND token = 'wUX6TLVFm/TK15mSWWr6/E+R9XNJ39Lgsg0EeauKRVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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