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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87f6da7fb8fca86deb973850434d50ed0936f6decb537183162e35f83adffae4' 
  AND token = '3DDgHnJhziv91NmlQnSGY6zHdvORGbhdDLMIIWxdF0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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