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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db8628b649c1d5fccf5153d10f149dd80c75c77b28800c72e8f584de790a3d9b' 
  AND token = 'YTVNYQRbG2Ai9SJftlTv2YM7LjkVBL4E8O7kk8TbL38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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