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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f89275be111db45b2948295fd9503c524aec90f40bcc1b359e4b2219098ea80' 
  AND token = 'MVXBeIUIBbclK8f5EqZKi5t1U3tUYBjZ4kva2EGgv8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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