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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73f4419716b2984495886eec131f406a140c8916018ae5d5ff3a360d55887318' 
  AND token = 'emHIWMhjZyt7FimVnPcTSRwPybnGCWpPHl5U8prZ4bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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