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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7efa273a24945595f3a8512581e32147714a39f85837745d49cd42193a827907' 
  AND token = 'UB0SVUy8plFncaZyqzOEdbWudywTqKKBE1sfO6hWqHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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