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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '420a49d7ca639279548f99ca5afcd2c1d16a778ce3cac7c3d4c90762bc19ccc0' 
  AND token = 'rdRdlzDJzOdTgTGdOtzvPFvBvO3kh8kqqMAco7tQxsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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