SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a472fec33f4051ece20c6a89f24068637c9460de65510a92b7ac23c159f7f40' 
  AND token = 'z13k4iEVw7c0/j3GpH6Ah4gXYKijnHbtM4iPrEDZOzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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