SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1058d2308ad91044e80a1bc4400b918336e096e2ff5be235d56738ae9b385e51' 
  AND token = 'KhrSBMXaFxSHLj3++GuTnvUvDWKnTb3VUVfuWiaYrAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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