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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a7fca7e77ce673f5c1a89245b51e37255cf142adca677bc7350d1c9a36fcbfb' 
  AND token = 'cPD0t07N9yUc7M8KDLELbT6mc+PsblvJfzEu+klnRds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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