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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '643c39c5ac4dd3006de32793d0edb848c6095584515ec834b9b588dd5d7e03c6' 
  AND token = 'muuI+DlkF3iP+ZaK2RIn7XWSB4M1XFxh7PnYE+WzzOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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