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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cae515e0b15170ca5345a011d58a51bf74e637d61670c7e52779b7178e8cf18' 
  AND token = 'rx8cG9eW4ml1T+8kYnbO2taOeuKEjT0l2zi4sOZpx4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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