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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c708b01a9e241e3b4de004a6e32dd00fc2d887ee8c7123a56f554c47eff086e' 
  AND token = 'vO/UX8K+yvuiWTbI1PaYmyL4h61Ig2MDmG+1ucwh06w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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