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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e772a91a37c2d3727706c3cbaebc876477b6591efc9a3f9f8c1a02392bcf3f5' 
  AND token = '8KtIz2BZQtCQ7pnrRKQmOMAPdalfZwgbu4EJAmxFn4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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