SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eda3d6961ae14b232180e25da72fc1f68b712fb4d77eb4a105a597d1f41573e2' 
  AND token = 'JBvGQN85y5Jgk0+savzbOMwGX478MZM9TXADmFhod0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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