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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29e52d60a43f48a08b645b421c8b726339b38078eb1338b173e8d8df4e63dac0' 
  AND token = '9VwTVxWxfTj8ERwpcgVCilH8VossJ65zNA375bCBSoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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