SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '500a68ed9f549a12373590f55f4e3693c9c97a88addf80eb69482fe832c371ed' 
  AND token = 'siaVLjE+JwISWTW54hjuHFgGXyqXrlAfH0AOhN/ovBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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