SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7aca7d22e0fab0af871bbc59d4ff448479920158b25766b582e0e6d8fe729947' 
  AND token = 'FXysFE/0HvdIRGu/j3lhPiu7YA3XFNL+hWJCXL/SYNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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