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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9853678240842558b0186fb9f9567059b3c7f48e2af4e5ae2de83d3f82ce8e07' 
  AND token = 'UppwXL3SOV+gCZpMOddbUoYRhpIdX+bTAFi3e75sJPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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