SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '076dab52d54f9cecaff1981538bf860a2e176e14b4571bc4e87be0cbffdd5984' 
  AND token = 'vzLrVQo3Zt+8klE8rqRklU68GHumPqXV3bySPNZ4Obw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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