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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a51ba0e231b3d30aa17be87c7eb23e133f064711b549afdec8250f2de9a227a' 
  AND token = 'lrxTA+qlUMB4J9h7fDiNzsj89CfJSso0LZ809w9nZwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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