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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3240826ff91c3a5f71c336bb4d4926be9bc80f5a94206bd21af9a0813081b0ee' 
  AND token = 'ueiBq8WMq5LeAQPq6KGDe9G3N3nocoge7OY3j0MDMyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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