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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce1be87eb10c8b186e11e635dc77b82d173353a8a2a189d6e00f57ef8e36c19f' 
  AND token = '164+Sidzj8rGV6wIK18Wai5YzyMSxnArFK15d03CThg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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