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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db6550c855f65e5a35a3532ebd7346272e8823e5ee0925ef736f9ad995dc1ceb' 
  AND token = '4l1x6ak2mhiUhMCCCp7sGrkExknT82T28jASjkX+iVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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