SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06587540a944c17840ce9ce6dc6635897925b7e0e92d768253325af7cf481a52' 
  AND token = 's6V18sd1iHBulX4hABLXMtOoJqGbxeIZWVhnVBUq+XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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