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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e9faa33544d649d56fdd17ad433d53c2176fcee4b29f082c6ce1bff41b488ff' 
  AND token = '27IU+gwoIeYc9v+sOE4xSvYI1yZ6lVsrWoO0+r3NOBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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