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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d3ba4dc4afe49932a9d9e95be33d051b976d44328e8a9982aa2fde117d49184' 
  AND token = 'CHwq/JMllCDOikw8hqvF+52FA/grgIEnaDkHgdiB+L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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