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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '532ab67d7f93f4ab98a7c23c101d3eecf744c2fca5e9b4adfb6435a586b3c34d' 
  AND token = 'vobjlaroOnUjVbt9Du4BMGGnCenrwdqG9prU0a+QH3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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