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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17521f7332bb0cc62533538f35570428a897dd30df2e22dff13d69fce1ea6b73' 
  AND token = '8eGiFKY/xD2QTjsK1C02YMraC/oAyXw5wo8jinEDW6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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