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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd81e9b05d42325badf93943f061785a11112cc10a83c96128ca42c355f10af4b' 
  AND token = 'imR0dHcbBxV3SvNuGzU1oWKjMdRcZCZH1diP3avGiEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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