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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2494f2e60d9734f63e7f4070d80cb8927683f3e68a71f0963f2469f41c77a5a3' 
  AND token = 'qKzXvsnO0RK8TWJJP8ArWn05IiQQnNgIw9XQPNWOubQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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