SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fe76f0b1fd5d2d0c53f8569c84ec10c2c13d1eb74d06745bfa35abd705b161b' 
  AND token = '+0qzGJDI/RzU/0z9MZIDvnbnO4Y7EgMrWsKZ03sD9JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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