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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d965a9ab3bdcb5948e7d731f42aafd7ca48bb78197fb7f0c598fb0a9c56d4ab' 
  AND token = 'nCJ0OSGZDXbD1tAAc0qPKVK5Mnir1EBll2rjZtkh1HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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