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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01d42c3b26b5e08217faf14486c7c3b55ad1c545c6a4ed01bcca783a8f4cab5a' 
  AND token = 'xMSSFCeeP+favXvTNYTO6xDkh01kgTQEN8RVg9NFjj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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